%0 Journal Article %T Geometry of Numbers %A Lin Weng %J Mathematics %D 2011 %I arXiv %X We develop a global cohomology theory for number fields by offering topological cohomology groups, an arithmetical duality, a Riemann-Roch type theorem, and two types of vanishing theorem. As applications, we study moduli spaces of semi-stable lattices, and introduce non-abelian zeta functions for number fields. %U http://arxiv.org/abs/1102.1302v2